<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !=0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="18" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域  -->
      <view class="history-list">
       <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',
        // 搜索结果列表
        searchResults:[],
        // 搜索历史
        historyList:[]
      };
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw')||'[]')
    },
    methods:{
      input(e){
        // console.log(e)
        clearTimeout(this.timer)
        this.timer = setTimeout(()=>{
          this.kw = e
          this.getSearchList()
          // console.log(this.kw)
        },500)
      },
      async getSearchList(){
        if(this.kw.length === 0){
          this.searchResults = []
          return
        }
        const{data:res}=await uni.$http.get('/goods/qsearch',{query:this.kw})
        if(res.meta.status != 200)
        return uni.$showMsg()
        this.searchResults = res.message
        
        this.saveSearchHistory()
      },
      gotoDetail(item){
        console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        // console.log(set)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        // 对搜索历史数据持久化
        uni.setStorageSync('kw',JSON.stringify(this.historyList))      
      },
    
    
    // 清空
    clean(){
      this.historyList = []
      uni.setStorageSync('kw','[]')
    },
    gotoGoodsList(kw){
      uni.navigateTo({
        url:'/subpkg/goods_list/goods_list?query=' + kw
      })
    }
    },
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    },
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top:0;
  z-index: 999;
}
.sugg-list{
  padding: 0 10px;
  .sugg-item{
    font-size: 12px;
    padding: 13px 20px;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: left;
    
    .goods-name{
      // 文字不允许换行（单行文本）
      white-space: nowrap;
      // 多余文字隐藏
      overflow: hidden;
      text-overflow: ellipsis;
      margin-right: 6px;
    }
  }
}
.history-box{
  padding: 10px 10px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    line-height: 30px;
    .uni-tag{
      margin-top: 10px;
      margin-right: 10px;
      
    }
  }
}
</style>
